Advanced Materials Research Vols. 108-111

Abstract: Designed the ZigBee network test and control system. The key points of transplanting embedded OS linux were introduced￡and the embedded ARM-linux development platform was designed￡A ZigBee wireless sensor network monitoring system based on the platform was achieved￡JN5121 as a single-chip microprocessor was designed to be wireless microcontroller￡while S3C2410 with an advanced ARM9 core and JN5121 were made to be net data concentrator￡The design has high rate hardware reusing device that can well communicate with remote control center.

Abstract: Unit testing is an important quality assurance activities in the process of software development, unit testing quality will have a great effect on the final quality of software products. In this article,we expatiate upon some critical factors of unit well testing in three aspects from the organizational structure, testing process and technology,that can serve as a software enterprises to carry out unit testing activities for reference.

Abstract: Streamline visualization is very important for the fluid dynamics and manufacture design. The visualization method constructed by the stream function and fluid flow model can not interactively change the visualization shapes upon the request to amend the surface. This paper presents a new visualization method with Bézier control mesh to achieve the streamline fluid flow visualization. The stream function is in accordance with the principles of fluid motion by using Bézier surfaces to find the constraint condition. The constructed surfaces can be interactively modified accurately to reflect the local details of the flow field to meet the engineering requirements. The streamline visualization can be modified and controlled interactively by a set of control parameters like the Bézier surface. It has an important practical value for fluid flow design and manufacturing.

Abstract: As special matrices, it is well known that the circulant matrices are very important. Various types of circulant matrices have been applied in such as signal dealing and oil exploration, and so on in recent years. In this paper, motivated by [1], we give some discriminations by using only the elements in the first row of the Level- -Circulant Matrices of Type and parameter on non singularity, and give two examples at last.

Abstract: In this paper, let and be deoted reducible companion matrices, we study the property of the Kippenhahn curve and of the numerical rang being an elliptic disc by making use of matrices Kronecker sum , Kronecker product and Hadamard product and the Kippenhahn curve continually.

Abstract: In many physical applications, we must solve a system of linear equations such as . The Kronecker sum can get a convenient representation for linear equations . In this paper, let and be denoted reducible companion matrices. We study the property of the Kippenhahn curve and of the numerical rang being an elliptic disc by making use of matrices Kronecker sum and the Kippenhahn curve continually.

Abstract: Two-dimension level posture sensor which can be sensitive to two vertical-directional tilt angle at one time is described. Adopt micro-machined technique two deep groove are corroded on the silicon plate, and two cantilever beams of metal heated hot wire is set up at each deep groove. Semicircle airtight space forms sense elements. Through two Wheatstone bridge, we get the tilt output voltage of x axis and y axis. To overcome environmental factors, a series of signal processing methods are proposed ,such as: zero temperature compensation, sensitive temperature compensation and linear compensation. The test about the sensor showed the sensor’s performance is as follow: resolution<0.05°,nonlinear<0.1%,the working temperature is enlarged.

Abstract: Micromachine airflow tilt sensor which can be sensitive to tilt angle is described. Adopt micro-machined technique two deep groove are corroded on the silicon plate, and two cantilever beams of metal film heated hot wire is set up at each deep groove. Semicircle airtight space forms sense elements. Through Wheatstone bridge, we get the tilt output voltage. Single-chip computer and temperature sensor constitute compensation circuit to achieve temperature compensation and linear compensation. The test showed the sensor’s performance is as follow: measuring range is ±30,resolution<0.1°, working temperature is better than 50ms ,nonlinear<0.1%.The sensor is not only in small size but also in simply crafting. It is good in sensitive organ’s output consistency, and suitable for mass production.

Abstract: The paper firstly introduced the sensitive mechanism of micromachined airflow omnibearing level posture. There is a non-closure annulus heat source in the airtight space, and around the heat source, there are eight parallel heat resistance wire composed omnibearing level posture sense organ. Signal processing circuit is composed by pre-signal circuit and digital circuit, to obtain voltage, omnibearing signal synthesis and resolution compensation of omnibearing tile angle signal. It is testified that: resolution<0.1°,the scope of azimuth is 360°,the scope of tile angle is 20°. The sensor is not only in small size but also in simply crafting. It is good in sensitive organ’s output consistency, and suitable for mass production.

Abstract: The learning algorithm of artificial neural network (ANN) trained with genetic algorithm (GA) are introduced, based on the operation data of hydropower station, the network model of energy characteristics is established based on GA-ANN, the relationship curve between head H and output N is gained under some efficiency. The results show that the algorithm is better than BP neural network and avoid the limitations of BP neural network, the results can be used in the optimal operation of hydropower, and it has a practical significance. The results show the new model has a great importance in hydraulic unit study. It could be generalized into other all efficiency prediction, and it offers a new way in water conservancy and at the meantime a new method for the study of ANN and GA.